What are the standard validations in Salesforce?

Hi Pranav,

System validations are the validation which are enforced by Salesforce like number field should not contains alphabets, phone number should be in valid format etc..

While custom validation rule are the one which are created manually under object.

There is a difference in order of execution for standard and custom validation. Standard validations are run before the before trigger event after that custom validation are executed.

Hope this helps.